如图，求解为什么我的答案不对啊？

Question

#include<stdio.h>
#include<math.h>
float x(int a,int b,float d);
float y(int a,int b,float d);
int main()
{
int a,b,c;
float d;
scanf("%d%d%d",&a,&b,&c);
d=b*b-4*a*c;
if(d>=0)
{
x(a,b,d);
}
else
{
y(a,b,d);
}
return 0;
}
float x(int a,int b,float d)
{
float p,q;
p=(-b+sqrt(d))/2/a;
q=(-b-sqrt(d))/2/a;
printf("x1=%.3f x2=%.3f",p,q);
}
float y(int a,int b,float d)
{
float p,q;
p=(-b)/2/a;
q=sqrt(-d)/2/a;
printf("x1=%.3f+%.3fi x2=%.3f-%.3fi",p,q,p,q); 
}

• 
  

Answer 1

#include<iostream>#include<cmath>#include<iomanip>using namespace std;int main(){int a,b,c;int t;//t就是b^2-4ac判断它和0的大小决定是解否是复数&nbsp;cout<<"推出请按Ctrl+c,输入a，b、c的值\n";//Ctrl+c是 windows下的文件结束符.在命令行下不是拷贝快捷键&nbsp;a=b=c=t=0;//初始化cin>>a>>b>>c;//输入数据&nbsp;if(a==0){printf("input error!\n");continue;}//如果输入二次项系数为零显示告诉用户&nbsp;t=b*b-4*a*c;if(t==0)cout<<"x1=x2="<<(-b/2a)<<endl;if (t<0){cout<<"x1="<<(-b/2.0/a)<<"+"<<(sqrt(-t)/2/a)<<"i"<<setprecision(3)<<endl;cout<<"x2="<<(-b/2.0/a)<<"-"<<(sqrt(-t)/2/a)<<"i"<<setprecision(3)<<endl;}else {cout<<"x1="<<(-b/2.0/a+sqrt(t)/2/a)<<setprecision(3)<<endl;cout<<"x2="<<(-b/2.0/a-sqrt(t)/2/a)<<setprecision(3)<<endl;}return 0;}&nbsp;

Answer 2